I'm converting my old slide films to digital. Some of them are 45 years old, and have strong colour casts. For instance old Agfachome has a heavy magenta cast. I can correct these individually using the dropper on a grey subject, but it's not always possible to find a neutral grey on every photo.
So I'd like to create a preset to uniformly remove the colour cast from each slide in a film. Is this possible?
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